Used to have friends that were veggie that would always do a veggie galette for things like xmas dinner to have alongside all the trimmings that the others were having with their turkey.
Was very tasty, alternating layers of pancakes and different sauces/veggies, depending on what they liked and fancied. So could be things like ratatouille, pesto, roasted veg, cheese sauce, chestnuts, pine nuts, all sorts of stuff would find their way in, would be different each time. You could probably put any of the savoury fillings in to it that have been mentioned on here, as long as there is enough moisture throughout so it isn't really dry.
Looked really nice, like a savoury gateau, they would use a spring-opening cake tin, had a frying pan that made pancakes the right size, so would cook up a batch then layer them with the fillings.
Pancakes make a nice change from pasta/lasagne although recently I've had a lasagne made using tortilla wraps rather than lasagne and that was surprisingly good - would be easier than making pancakes!
Had the advantage of being better if you made it in advance and then reheated the next day by which time the flavours had all had time to develop. Then you just need to pop it out of the tin and onto a serving plate, maybe sprinkle a bit of grated cheese on top, few chopped herbs and serve. Because it looks like a cake it looks really impressive and doesn't get mistaken for an extra stuffing!